The setup program should have made appropriate links to the "Citrix Receiver for Linux" plugin.
You can check this as such:

# find / -name npica.so
/opt/Citrix/ICAClient/npica.so

Or you can check if your browser loads the plugin, in Firefox this can be done by typing "about:plugins" in the address bar. If you have a 64-bit version of Firefox, the plugin will not be loaded. You can check below what to do.

Create missing links as such:

# ln -s /opt/Citrix/ICAClient/npica.so /usr/lib/mozilla/plugins/

Step 6. Restart your browser

At this point, everything should work, including wfcmgr. In the case of Opera, integration should be automatic. The ICAClient will automatically be launched whenever you try to access a citrix-based application from either Firefox or Opera.

Note: If for some reason firefox prompts you for which application to use when opening a citrix-based application, use /opt/Citrix/ICAClient/wfica

TLS/SSL Certificates

Because ICAClient uses SSL you may need a security certificate to connect to the server, check with the server administrator. If there is a certificate download and place it in /usr/lib/ICAClient/keystore/cacerts/.

You may then receive the error You have not chosen to trust the issuer of the server's security certificate. (SSL Error 61).

There may be several reasons for this:

You do not have the root Certificate Authority (CA) certificates.

These are already installed on most systems, they are part of the core package ca-certificates, but they are not where ICAClient looks for them. Copy the certificates from /etc/ssl/certs/ to /usr/lib/ICAClient/keystore/cacerts/. For Citrix versions before 13.1, run the following command as root:

# ln -sf /etc/ssl/certs/* /opt/Citrix/ICAClient/keystore/cacerts/

Since versions 13.1, Citrix needs the certificates in separate files. You need to run the following commands as root:

You may also need to download your CA's intermediate certificates and store them in the same directory.

Changes to your certificate directory will likely require rehashing links for openssl to find them properly. Skipping this step might result in Citrix still giving certificate errors. To do this, use this command (borrowed from [1])

This article or section is out of date.

Reason: After the last [April 2018] openssl upgrade, the c_rehash command is broken in Arch. [unless the command hasn't been deprecated upstream, this should be a bug report] (Discuss in Talk:Citrix#)